Pump for type-casting machines.



No. 734,597. PATENTED JULY 28, 1903.

F. E. PEAOOGK.

PUMP FOR TYPE CASTING MACHINES.

-APPLIOATION IILBD D30. 31, 1902.

N0 MODEL. 3 SHEETB-BHEET 2.

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Q; W 3 #w in W No. 734,597. PATENTED JULY-28, 1903.

F. E. PEAGOGK'. PUMP FOR TYPE CASTING MACHINES.

APPLIOATION FILED DEC. 31, 1902.

NO MODEL. 3 SHEETS-SHEET 3,

48 I 49 1 n'n fln A I J]-A 4] 63 7 Fig.6.

. UNITED STATES Patented July 28, 1903.

PATENT ()FFICE.

FREDERICK EDE PEACOCK, on WEYBRIDGE, ENGLAND. V

.PUMP FOR TYPE-CASTING MACHINES.

SPECIFICATION forming part of Letters Patent No. 734,597, dated July 28,1903.

Application filed December 31, 1902. Serial No. 137,303. (No model.)

To-aZZ whom it may concern:

Be it known that I, FREDERICK EDEN PEA COOK, of Weybridge, in thecountyof Surrey, England, have inventedcertain new and usefulImprovements in Pumps for Type-Cast: ing Machines; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as willenable others skilled in the art to which itappertains to make and use the same. I

The present invention relates toimprovements in the pumps oftype-casting machines; and the objects of it are, first, to prevent thepresence of the delivery-valve or of its seat constricting thedelivery-port, and, second, to provide for the said valve being movedquite out of the path of the'metal bythat motion of it that opens thedeliveryport. These two objects are secured by the following means: Thepump-cylinders are arranged in pairs, so as to eject metal alternately.A separate delivery-port starts from each cylinder at the junction ofthe latter with the prolongation next described and runs in thedirection of the delivery-nozzle, that is cornmon to allthe ports. Itiscontrolled by a delivery-valve of the piston-type working in an axialprolongation of the respective cylin ders, so that thevalve has noseatingto constrict the delivery-port. Each delivery-valve Works inharmony with its fellow valve by being loosely connected to therespective end of a centrally-fulcrumed lever situated outside therespective pair of cylinders. The power necessary to. eject the metalfrom the cylinder is applied thereto by either a piston or byairpressure, whichever ,is preferred.v

At the moment when the power is brought to bear upon the metal in acylinder the respec tive delivery-Valve is holding the deliveryportclosed, so that the said valve is forced downward into the prolongationpast the delivery-port, and therefore out of the path of the metal,thereby opening the said port to its full sectional area. At the sametime the power is taken off the metal in the opposite cylinder and itsdeliveryvalve raised to close the respective delivery-port. There may beas many pairs of, cylinders, pistons or airpressures, anddelivery-valves in each complete pump as may be desired. The commondelivery-port to the nozzle is provided with a stant.

as shown in Figs. 3 and 5.

loaded piston having a relief-port to keep the delivery ofthe metalthrough the nozzle con- This relief-port is in the side of the pistonandextends from the inner end of it outward far enough to open to the airat the proper moment.

Referring to the accompanying figures, Figure 1 is a side elevation,partly in section, on the line 1 1 of Fig. 3 of a four-paircylinder-pump having cylinder-pistons worked'by two shafts driven by onedriving-pulley; Fig. 2, an inverted plan of the port end of therelief-valve; Fig. 3, a sectional front elevation .on the line 3 3 ofFig. 1; Fig; 4, a horizontalsection on-the line 4 4 of Figs. l and3;Fig. 5, afront elevation, partlyin section, on the line 5 5 of Fig. 1;Fig. 6, a transverse'sectional elevation on the line 66 of Fig. 7 of'aone-pair cylinder-pump worked by air-pressure; Fig. '7, a plancorresponding with Fig. 6, and Fig. 8 an enlarged sectional plan on -theline 8 8 of Fig. 6.

' Referring to Figs. 1 to 5, the power necessary'to eject the metal froma cylinder is shown as applied through ordinary pistons. 1 is themetal-pot, and 2 the cylinder-block, having, among other parts describedfarther on, the piston-cylinders 3 and'the metal-supply-ports 4, formedtherein. These ports are alternately closed and opened by the recipro- Ications of the respective. pistons described The cylinder-block 2 issupportfurther on. ed at the proper height in the metal-pot 1 to keepthe ports 4 below the surface of the metal in the said pot. This iseffected by bolting it to the sides of the pot 1 or to the bottom of theplate-5, which support the pair of standards 6 6, that carry thebearings 7 7 of the piston'shafts 8 9, and which plate 5 is screwed downupon lugs or ledges 10 10, projecting inwardly from the sides of thepotl, 11 12 are two spur-pinions fast, respectively, on the shafts 8 9,and 13 is a drivingrpulley on the prolongation of the shaft 9, wherebyboth the said shafts are driven at the same speed. -14 14:

are the eccentrics, and 15 15 the pitmen by which the shafts actuate thepump-pistons 16. 17 17 are piston-guides carried, by the two standards 66. 18 l8arethe-deliveryports from the respective piston-cylinders 3 to19, the delivery-port common to them all,

and which latter terminates inthe usual nozzle 20. 21 is the cylinder ofthe relief-valve in communication with the port 19; 22, its piston,pivoted by its top to 23, its lever, and 24the weight, adjustablelengthwise thereon. All the above-mentioned parts are well known inconnection with type casting machines and may be of any suitableconstruction.

It has been already explained that there may be as many pairs of pistonsand deliveryvalves in each complete pump as may be desired. The oneillustrated comprises four pairs, two pairs to each shaft 8 9, theeccentries on the shaft 8 being preferably set at one hundred and eightydegrees with the respectively adjacent eccentrics on the shaft 9, asindicated in Fig. 3. Looking at Fig. 1, the first and second pistonsfrom the right hand are necessarily at one hundred and eighty degreeswith each other and the same with the third and fourth. The third is atninety degrees with the second, and the fourth is level with thethird-t. e., at one hundred and eighty degrees with it horizontallythefirst and fourth piston descending and the second and third ascending,as indicated by the arrows.

Itisa matter of indifierence in a pump comprising more than one pair ofpistons or airpressures and delivery-valves whether two, one behind theother, are paired together, as shown in Fig. l, or Whether two by theside of each other are so paired together, as shown in Fig. 6. Thedelivery-valve mechanism of any pair of pistons and delivery-valves is areplica of that of any other pair, so that a description of one of thepairs Willsuffice. The two pistons 16 to the right of Fig. 1 are set atone hundred and eighty degrees with each other. 25 and 26 are therespective deliveryvalves. They are of the piston type, are notconnected to the respective pistons 16, and work in their respectivecylinders 27 and 28, a valve-cylinder being axially alined with therespective pump-cylinder 3, its valve being immediately beneath therespective piston. Each valve has the same stroke, that being equal tothe vertical depth of the respective port 18. 29 is a closed chamber inthe cylinder-block 2 to make room for the downward strokes of thepiston-valves 25 and 26, the equal-armed lever 32, which connects them,having its outer ends pivoted to them, as shown in Fig. 1, and the shaft33, which serves as a fulcrum for the latter and which is carried by theblock 3, as shown in Fig. 2. The function of the lever 32 is to transferthe motion of one valve to the other Without changing the rate of it, inorder that when one valve is at the top of its stroke the other oneshall be at the bottom. The chamber 29 is closed at the bottom by aclosing-plate 34, which serves also as a stop for the downward stroke ofone valvesay 25and therefore for the upstroke of the other one of thesame pair. Fig. 1 shows the left-hand piston 16 of the pair underdescription at the bottom of its stroke, its working face being thenflush with the bottom of the delivery-port 18 and the right-hand piston16 of the same pair at the top of its stroke and the respectivemetalsupply port 4 open. Its cylinder 3 is therefore full of metal. Atthe same moment the valve 25 holds the said ports 18 open, theright-hand piston '16 and valve 26 being in the opposite positions forthe reasons already given. The power of the right-hand piston 16 as itmakes its downstroke (indicated by the arrow in Fig. 1) is brought tobear upon the face of the valve 26 by the interposed and inclosed metalin the respective cylinder 3, and the said valve is forced down itscylinder 28 upon the stop 34, thereby being moved out of the path of thepiston, which path terminates on a level with the bottom of therespective port 18. This motion of the valve 26 also opens the saidport. Both pistons being worked from the same shaft and the valve 25 bythe valve 26, acting through the lever 32, as the right-hand piston 16and valve 26 descend the left-hand piston 16 and valve 25 are raised,the said piston 16 filling its cylinder with metal through itsmetal-supply port 4 and the valve 25 closing the respective port 18,after which the continued rotation of the shaft 8 makes the said piston16 and valve 25 act in the same way as just described with reference tothe right-hand piston and its valve 26, while it has held for the propertime the latter in the respective positions described with reference tothe lefthand piston 16 and i s valve 25.

Referring to Figs. 6 to 8, the power necessary to eject the metal from acylinder is shown as applied by air under pressure. 1 is the metal-pot,as in the preceding figures. 40 and 41 are the cylinders, supported by abridge-piece 42, bolted down upon flanges 43 43, projecting inwardlyfrom the sides of the metal-pot. The air is fed constantly through apipe 44, which delivers into a cook 45 and from which two branches 4647communicate with the cylinders 40 and 41, respectively, preferablythrough their closed tops 48 49, as shown in Fig. 6, or at any rateabove the level of the metal-supply ports 50 51. 52 is a port in thecock-plug 53 adapted to establish communication between the main pipe 44and the two branches 46 and 47 (and consequently the cylinders 40 and41) alternately,

and 54 is a port in the said plug adapted to I establish an alternatecommunication between the said two branches and the two cylinders on theone hand and the open air on the other. The ports 52 and 54 are soarranged with reference to each other that when the port 52 is admittingair-pressure into one cylinder 40 or 41 from the main supply 44 the port54 is allowing the air-pressure in the other cylinder to exhaust intothe open air. The cock-plug 53 is rotated with an intermittent motion,but in the same direction, by means of a suitably mounted and drivengear 55, mutilated through half its ciroumference, and thereforealternately engaging with anddisengaging from a gear 56, fast -ver 70.

' as that shown in Figs. 1 to 5.

on the said plug. This gear 56 is continuously driven in the samedirection by mechanism. (Not shown.) 57 58 are reciprocating valveshaving ports 59 60 to control the above-mentioned metal-supply ports 5051. Each valve works in a casing 61, fast on the respective cylinder andopen on one side to the metal in the metal-pot 1. Both are connected byvalve-rods 62 to the respective end of a lever 70, centrally fulcrumedupon a rod 63, supported by lumps 64, (only one shown,) fast to the pot1, this lever corresponding functionally with any one of the levers 32of Figs. 1 to 5. 64 65 are the two deliveryvalves correspondingfunctionally with the valves 25 and 26 of Figs. 1 to 5, and 66 67 theircylinders, likewise corresponding with the cylinders 27 and 28 of thesaid valves25 and 26. Each valve 64 65 has a tail 68, connected by apin-and-slot device 69 to the le- 71 is the common delivery-port fromthe cylinders under the control of the valves 64 65 and communicateswith the port.19, terminating in the nozzle 20. The reliefvalve is ofthe same construction throughout The piston 22 of this valve is shown indetail in Figs. 1 and 2. 72 is a tapering port extending upward from thebottom face of it, where it is largest,

to a line where it merges in the surface of the Valve, so that thehigher the pressure in the pump raises it against the adjusted weight 24onv the relief-valve lever the more considerable will be its relievingeffect.

The action of the improvement illustrated in Figs. 6 to 8 is as follows:Air under pressure is flowing into the cylinder 41, previously chargedwith metal through the ports 60 and 51, and acting through the metalbetween the level of the port 51 and the delivery-valve 65 drives thelatter down, thereby rocking the lever 70, closing the port 51, openingthe port 71 to the cylinder 41, and making the valve 64 close the port71 next the cylinder 40, whereby metal from the cylinder4l is ejectedthrough the port 19 and nozzle 20. This ejection continues during thetime that the gear 55 is disengaged from the gear 56 on the cockplug 53,which is therefore at rest, allowing the unused air-pressure in thecylinder 40 to exhaust through the port 54 for the purpose of allowingthe said cylinder to be charged with metal through the ports 59 and 50,the

formerhaving been put in register with the latter by the above-mentionedrock of thelever 70. 1

. I claim- 1. In the pump of a type-casting machine, the combination ofa pair of pump-cylinders;

a pair of valve-cylinders being axial prolonga-.

tions thereof; a pair of piston-valves working in the latter; a rockinglever to which both the said valves are connected; deliveryports fromthe pump-cylinders to the nozzle alternately opened and shut by thedeliveryvalves; metal-supply ports to the cylinders and means forexerting an expelling pressure upon the metal in the'pump-cylindersalternately the same means sufiicing to open the respectivedelivery-ports by moving the delivery-valve'clear out of the path of themetal to be expelled from the respective pump-cylinder, shut off theother pump-cylinder from the delivery-port and provide for thelast-mentioned cylinder being charged.

2. In the pump of a type-casting machine, the combination of a pair ofpump-cylinders; a pair of valve-cylinders being axial prolongationsthereof; a pair of piston-valves working in the latter; a rocking leverto which.

both the said valves are connected; deliveryports from thepump-cylinders to the nozzle alternately opened and shut by thedeliveryvalves; metal-supply ports to the cylinders; means for exertingan expelling pressure upon the metal in the pump-cylinders alternately,the same means sufficing to open the respective delivery-port by movingthe delivery-valve clear out of the path of the metal to be expelledfrom the respective pump-cylinder, shut off the other pump-cylinder fromthe delivery-port and provide for .the lastmentioned cylinder beingcharged; main-delivery-port to nozzle; and piston relief-valve; cylinderfor it to work in communicating with the said port; a port in the sideof the said valve extending upward from the bottom face of it where itis largest to a line where it merges in the surface of the valve; andyielding means for pressing the said valve toward the delivery-portabove mentioned.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

FREDERICK EDEN PEACOOK.

Witnesses:

CHAS. S. WOODROFFE, WARWICK H. WILLIAMS.

too

